Ripped from http://www.smart-electro.net/faq.html
"In a straight line matrix, for each person to receive an item, you must fill the matrix. What this means is best described by the following scenario. Based on a 5 person matrix, someone will receive an item every time 5 new people join:

I signed up for a PSP. If it doesn't work, I get my money back, plain and simple. I signed up once for a PS2, but then backed out, and got my money back. But I've never actually got anything from them yet.